communicators/winrm: respect boot_timeout when fetching winrm_info #6229
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We gained a ton of improvemnts to WinRM error handling in
#4943, but we also got one bug.
The new code raises an exception when
winrm_info
does not return rightaway. This was preventing us from catching the retry/timout logic that's
meant to wait until boot_timeout for the WinRM communicator to be ready.
This restores the proper behavior by rescuing the WinRMNotReady
exception and continuing to retry until the surrounding timeout fires.